Process for purifying water containing mineral salts.



P. MUNZER.

PROCESS FOR PURlFYlNG WATER CONTAINING MINERAL SALTS.

APPLICATION FILED MAR-24,1916.

Patented Sept. 26, 1916.

WM names UNITED STATES PATENT, OFFICE.

PAUL ME'NZER, OF BRAUNSFELD, NEAR COLOGNE, GERMANY, ASSIGNOR TO BEISER'IAUTOMATIC WATER PURIFYING COMPANY, A CORPORATION OF NEW JERSEY.

PROCESS FOR PURIFYING WATER CONTAINING MINERAL SALTS.

Specification of Letters Patent.

Patented Sept. 26, 1916.

Original application filed January 28,1910, Serial No. 540,554. Dividedand this application filed March 24, 1916. Serial No. 87,164.

* To all whom it may concern Be it known that I, PAUL MiiNzEn, a subjectof the Emperor of Germany, residing at Braunsfeld, near Cologne,Germany, have invented certain new and useful Improvements in' Processesfor Purifying Water Containing Mineral Salts, of whichthe following is aspecification.

This invention relates to a process for the purification of water bymeans of a barium salt or the like, particularly carbonate of barium.The present application is a division of my allowed patent applicationSerial No. 540,554, filed January 28, 1910.

In the purification of Water by the aid of lime and carbonate of bariumthe necessary quick lime required for the removal of the bi-carbonate ofcalcium, and of the magnesia" is added to the water to be purified inthe form of a saturated aqueous solution of lime in exactly measuredquantity, while the carbonate of barium requisite for the removal of thesulfate of lime must be added in large excess and be continuouslypenetrated by the entire quantity of water to be purified. Inconsequence of the admixture of the saturated solution of lime, thespace available for the purification with barium in which the carbonateof barium is placed (the socalled barium bath) is considerably occupiedby the deposit formed from the bi-carbonate.

The carbonate of barium'is graduallyrendered impure by the deposit ofthis mud which is of no value for the purification process, so thatfinally in order to obtain the necessary space for. the carbonate ofbarium, a large proportion of the mud, which nevertheless contains alarge part of the still available carbonate of barium, must be thrownaway. In order to prevent this loss of the useful carbonate of bariumand to utilize the same to the uttermost, the present invention has beenmade. This invention consequently is designed to efi'ect the removal ofthe bi-carbonates from the water to be purified in special receptaclesbefore the water can enter the barium bath, and the first mentionedspace must be cleaned out more frequently and in it moreover may bedeposited the residues from the barium bath .before these latter areentirely'thrown away.

By this means one is enabled to exhaust the last remainders that is theunspent carbonate of barium.

Apparatus for carrying out my process is illustrated 1n section invarious forms in Figures 1 and 2 of the drawings.

Fig. l is a sectional view of one form 0 the apparatus for carryingout'the process. Fig. 2 is a sectional view of another form of theapparatus for carrying out the process.

The crude water flows into the chamber a: 1

The mixture rises and passes after the chemical reaction is complete andthe precipitant formed has been for the most part separated by settlingthrough the pipe d (Fig. 1) or the branch pipes d (Fig. 2) into thebarium bath in the vessel 6, at this point the second step of theprocess is carried out. The precipitate produced in the chamber acollects underneath in the cone of this chamber and is dischargedtherefrom through the cock f. In the chamber a carbonate of barium inexcess and in the floating condition is penetrated by the water and thesulfate of lime is converted into the insolublesulfate.

of barium. From time to time a portion of the precipitate which stillcontains carbonate of barium is run off out of the chamber 6 .into thechamber a. The water passing into this chamber which still contains itsentire amount of sulfuric acid, exhausts the remaining portion of thecarbonate of barium.

It cannot, however, be entirely freed from the sulfuric acid by thismeans, but by consuming the carbonate of barium it renders the removalof the precipitate possible without waste of barium and the consequentmaintenance of a quantity of precipitate or mud in the vessel econtaining the barium bath together with the necessary excess ofcarbonate of bariumrequisite for the complete removal of the sulfuricacid.

- In carrying out the process as shown in Fig. 1, the removal of aportion of the precipitate from the chamber e into the chamber a takesplace by opening the valve 11 in the pipe h. When the valve 11 isclosed, no barium'carbonate can pass from the upper to the lowerchamber. It is also feasible to draw ofi the precipitate from thechamber e at first to the outside into a special container (not shown).In case a special pipe is made use of as in Figs. 1 and 2 fordischarging the precipitate from the baryta vessel 6 into the limepurifying vessel 0., I may accurately measure and observe the amount ofprecipitate so removed. I introduce a measuring vessel is as shown inFig. 2 in order to do the measuring. This vessel may be open above orclosed. It is shown closed in Fig. 2.

My process is carried out as follows: The valves Z and m are closed andthe air valve 72. and the valve 0 are open so that the precipitate fromthe vessel 6 containing the barium bath can pass into the measuringvessel is. When this vessel is filled, the valves n and 0 are closedagain and valves Z and m are opened. Through the valve m water underpressure passes in,namely water to be purified, and forces theprecipitate out of the vessel 71: into the vessel 0.. Through the window12, the passage of the precipitate to the vessel k can be observed. Whenthe precipitate is removed from the vessel k the valve m is closed.

In the case of waters which contain no bicarbonate and consequently areto be treated exclusively with carbonate of barium, and not with limewater as well, there occurs a collection of worthless precipitate in thebarium chamber so that after a certain period a portion of theprecipitate which" nevertheless still contains barium carbonate must bedischarged. For such waters the described procem by means of which thecleansing process is divided into steps can also be applied in order toobtain a better utilization of the carbonate of barium. The water to bepurified first. flows into the chamber a in which in such a case no limeneed be introduced. Into the vessel a however the partially exhaustedbarium carbonate proceeding from previous water purifications which takeplace in chamber .6, is introduced. This barium carbonate is thus almostcompletely utilized and used up. By this means a partial removal of thesulfuric acid compounds contained in the water takes place in the vessela, while the complete purification takes place in the chamber 6 by meansof the fresh barium carbonate contained therein.

What I claim is:

1. The process of purifying water which consists in passing Waterthrough a barium bath and utilizing the deposit therefrom containingunspent barium carbonate to effect a preliminary and partialpurification consists in first removing bi-carbonates or the like bymeans of lime and then passing the Water through the barium bath toremove sulfuric acid or the like and admitting the deposit from thebarium bath, containing unspent barium carbonate, tothe Water undergoingthe lime reaction.

4. The process of purifying water which consists in treating the waterwith barium carbonate and causing the water as a preliminary treatmentto exhaust the unspent barium carbonate in the deposit obtained from thereaction.

5. The process of purifying water which consists in separately removingbi-carbo-- nates or the like from the water by means of lime, andsulfuric acid or the like by means of barium carbonate and causing thewater before treatment with the barium carbonate to exhaust the unspentbarium carbonate from the deposit formed in the main barium reaction.

6. The process of purifying water which consists in removing sulfuricacid or the like from the Water by means of a reagent and utilizing thedeposit formed, containing unspent reagent, to effect a preliminary andpartial purification of the water.

7. The process of purifying water which consists in separately removingdifi'erent kinds of impurities from the water by suitable reagents, andutilizing the deposit formed by one of the reactions, such depositcontaining unspent reagent, to effect a preliminary and partial removalof the corresponding impurity from the water.

In testimony whereof, I have signed my name to this specification, inthe presence of two subscribing witnesses.

PAUL MUNZER.

Witnesses:

J. WYNERS, J. F. Zmsnonn.

